Dokin-chan recurs across the *Soreike! Anpanman* franchise, including the film *Buruburu no Takarasagashi Daibōken!*, where she features as part of the cast. She appears as an anthropomorphic germ with an orange-red body, white face, green eyes, a single antenna, long tail, pink shoes, and white hands. Her face exhibits small red cheeks and a nose, connected by an orange line extending from her face to her nose.

As Baikinman's primary partner in crime, she operates as a secondary antagonist, aiding his schemes. Her personality blends selfishness, demanding behavior, childishness, and greed; she frequently bosses Baikinman around and flees when plans unravel. Yet she occasionally reveals underlying kindness, particularly toward Shokupanman, whom she obsessively adores. This fixation drives extreme actions like decorating her room with Shokupanman merchandise and daydreaming about their relationship.

She maintains a dynamic with her younger sister, Kokin-chan. Though they sometimes cooperate, they often clash due to rivalry over Shokupanman. Dokin-chan's partnership with Baikinman involves strained mutual cooperation—she treats him rudely and demandingly but demonstrates subtle care beneath the surface.

Historically, she wielded a specialized staff: one end enlarged objects, the other reduced them. This tool appeared briefly in early episodes before being phased out. She also owns a pink UFO with yellow hands, used for transportation and occasionally holding hostages during Baikinman's plots, though it rarely engages in direct combat.

Her character remains consistent franchise-wide without significant development or expanded backstory. In *Buruburu no Takarasagashi Daibōken!*, she upholds her established traits. Available sources do not elaborate on her specific role in the film's plot, and no additional character evolution or unique contributions to this movie are documented.